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Home > Art, Film & Photography > Safety Engineering Volume 34
Safety Engineering Volume 34

Safety Engineering Volume 34


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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1917 Excerpt: ...extreme temperature the insulation of the conductors on the motor perishes and frequently takes fire, emitting heavy black smoke. If the automatic protective devices of a motor are such as are prescribed by the Underwriters or public authorities, and in good order, the chance of a direct current motor burning up is remote. Should the current through one of the armature coils of a direct current motor be intermittently interrupted it will also cause a serious condition. The armature is the revolving1 portion and is made up of a number of coils and on one end is the commutator, upon which the brushes rest. When the current through one of the armature coils is intermittently interrupted the commutator will throw a shower of sparks having a fan wheel effect and any inflammable material close by may be set on fire. Whenever any abnormal condition arises in a direct current motor it means a rise in the flow of current. If the safety devices are right the current will be cut off before it can do harm. In two-and three-phase motors the interruption of the current through one of the phases or circuits will sometimes cause the motor to stop and heat up. Unless all the current to the mo-, tor is cut off within a short time, the heat will rise to a point sufficient to burn up the insulation and destroy the motor windings. The rise of temperature in this type of motor is slow and the burning of the insulation is quickly detected by anyone in the vicinity. However, there are plenty of motors in isolated places, in locked buildings and other places where no one is present, which are under automatic control for the operation of sump pumps, house tank pumps and other purposes, that frequently burn up before the trouble is detected. It is possible at the present time to purc...


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Product Details
  • ISBN-13: 9781231216101
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 272
  • Spine Width: 14 mm
  • Width: 189 mm
  • ISBN-10: 1231216107
  • Publisher Date: 01 May 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 490 gr


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